Foster arrived on a season-long loan from Birmingham City during the close season following the departure of Scott Carson and after parent club Blues were relegated. Kiely has been impressed with what he's seen so far.
"Scott made a decision to go so we had an obligation to fill that position," he said.
"I was involved in those discussions, drew up lists of potential signings, watched games and did reconnaissance on those targets.
"We had a list of ten or 12 goalkeepers we whittled down to five or six. Those were then whittled down to two or three. From my point of view you know you're getting a top goalkeeper.
"You don't play for Manchester United and England if you have no ability. For me, his personality and character lends itself to a positive environment. He works with a smile on his face and is a pleasure to deal with, as was Scott.
"I've been a Premier and international keeper myself and as coach I am trying to get them in the right frame of mind and polishing them up.
"You want goalkeepers to be dependable, reliable and of good character, which Ben is. It shows the progress we have made as a club."